No sound with MPD SNAPSERVER built-in

[calanor]

Hi,
I've been using sanpserver with mpd for a long time without any problem using fifo.
I have seen that the latest versions of mpd include the snapcast server. I've been testing but can't get it to work.
I use this configuration for both options:

audio_output {
    type            "fifo"
    name            "snappipe"
    path            "/tmp/snapfifo"
    format          "48000:16:2"
    mixer_type      "software"
}

audio_output {
    type            "snapcast"
    name            "SNAPSERVER"
    host            "0.0.0.0"
    format          "48000:16:2"
    mixer_type      "software"
}

The client command line for both outputs :
snapclient -h 192.168.1.123 -s 3 --logfilter *:debug --player alsa

With "snappipe" output it sounds without any problem. With "SNAPSERVER" output is no sound and the debug output is like:

2021-03-23 07-30-34.350 [Info] (Snapclient) Version 0.24.0, revision 7eff45fd
2021-03-23 07-30-34.352 [Info] (Connection) Resolving host IP for: 192.168.1.123  
2021-03-23 07-30-34.353 [Info] (Connection) Connecting
2021-03-23 07-30-34.358 [Notice] (Connection) Connected to 192.168.1.123  
2021-03-23 07-30-34.360 [Info] (Connection) My MAC: "b8:27:eb:XX:XX:XX", socket: 8
2021-03-23 07-30-35.235 [Debug] (Connection) outstanding async_write
2021-03-23 07-30-35.244 [Info] (Controller) ServerSettings - buffer: 1000, latency: 0, volume: 17, muted: 0
metadata:{"STREAM":"default"}
2021-03-23 07-30-35.248 [Info] (Controller) Codec: flac, sampleformat: 48000:16:2
2021-03-23 07-30-35.250 [Info] (Player) Player name: alsa, device: sysdefault:CARD=Headphones, description: bcm2835 Headphones, bcm2835 Headphones
2021-03-23 07-30-35.250 [Info] (Player) Default Audio Device, idx: 3, sharing mode: unspecified, parameters: <none>
2021-03-23 07-30-35.255 [Info] (Player) Mixer mode: software, parameters: <none>
2021-03-23 07-30-35.256 [Info] (Player) Sampleformat: 48000:16:2, stream: 48000:16:2
2021-03-23 07-30-35.260 [Info] (Alsa) Using default buffer_time: 80 ms, default fragments: 4
2021-03-23 07-30-35.276 [Debug] (Alsa) ACCESS:  MMAP_INTERLEAVED MMAP_NONINTERLEAVED MMAP_COMPLEX RW_INTERLEAVED RW_NONINTERLEAVED
2021-03-23 07-30-35.276 [Debug] (Alsa) FORMAT:  S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE MU_LAW A_LAW IMA_ADPCM S20_LE S20_BE U20_LE U20_BE S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE U18_3BE
2021-03-23 07-30-35.276 [Debug] (Alsa) SUBFORMAT:  STD
2021-03-23 07-30-35.276 [Debug] (Alsa) SAMPLE_BITS: [4 64]
2021-03-23 07-30-35.276 [Debug] (Alsa) FRAME_BITS: [4 640000]
2021-03-23 07-30-35.276 [Debug] (Alsa) CHANNELS: [1 10000]
2021-03-23 07-30-35.276 [Debug] (Alsa) RATE: [4000 4294967295]
2021-03-23 07-30-35.276 [Debug] (Alsa) PERIOD_TIME: [10000 16384000]
2021-03-23 07-30-35.276 [Debug] (Alsa) PERIOD_SIZE: [40 4294967295]
2021-03-23 07-30-35.276 [Debug] (Alsa) PERIOD_BYTES: [20 4294967295]
2021-03-23 07-30-35.276 [Debug] (Alsa) PERIODS: (0 107374183)
2021-03-23 07-30-35.276 [Debug] (Alsa) BUFFER_TIME: [1 4294967295]
2021-03-23 07-30-35.276 [Debug] (Alsa) BUFFER_SIZE: [5 4294967294]
2021-03-23 07-30-35.276 [Debug] (Alsa) BUFFER_BYTES: [3 4294967295]
2021-03-23 07-30-35.276 [Debug] (Alsa) TICK_TIME: ALL
2021-03-23 07-30-35.294 [Info] (Alsa) PCM name: sysdefault:CARD=Headphones, sample rate: 48000 Hz, channels: 2, buffer time: 80000 us, periods: 4, period time: 20000 us, period frames: 960
2021-03-23 07-30-35.298 [Debug] (Player) setVolume exp with base 10: 0.17 => 0.0532343
2021-03-23 07-30-35.301 [Debug] (Alsa) Resizing buffer from 0 to 15360
2021-03-23 07-30-35.302 [Info] (Stream) No chunks available
2021-03-23 07-30-35.303 [Info] (Alsa) Failed to get chunk
2021-03-23 07-30-35.404 [Debug] (Alsa) Waiting for chunk
2021-03-23 07-30-35.555 [Info] (Controller) diff to server [ms]: -1.61521e+08
2021-03-23 07-30-37.410 [Debug] (Alsa) Waiting for chunk
2021-03-23 07-30-39.415 [Debug] (Alsa) Waiting for chunk

[ last line infinitely repeated ]

MPD and MPC versions:

Music Player Daemon 0.23~git (v0.22.6-447-ga7ba10423)
Snapclient Version 0.24.0, revision 7eff45fd

Any help will be appreciated.